[PATCH] uio: uio_pci_generic: don't fail probe if pdev->irq equals to IRQ_NOTCONNECTED

[jie6.li]

From: Jie Li <jie6...@samsung.com>

Some devices use 255 as default value of Interrupt Line register, and this
maybe causes pdev->irq is set as IRQ_NOTCONNECTED in some scenarios. For
example, NVMe controller connects to Intel Volume Management Device (VMD).
In this situation, IRQ_NOTCONNECTED means INTx line is not connected, not
fault. If bind uio_pci_generic to these devices, uio frame will return
-ENOTCONN through request_irq.

This patch allows binding uio_pci_generic to device with dev->irq of
IRQ_NOTCONNECTED.

Signed-off-by: Jie Li <jie6...@samsung.com>
Acked-by: Kyungsan Kim <ks0204....@samsung.com>
---
 drivers/uio/uio_pci_generic.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/uio/uio_pci_generic.c b/drivers/uio/uio_pci_generic.c
index b8e44d16279f..c7d681fef198 100644
--- a/drivers/uio/uio_pci_generic.c
+++ b/drivers/uio/uio_pci_generic.c
@@ -92,7 +92,7 @@ static int probe(struct pci_dev *pdev,
        gdev->info.version = DRIVER_VERSION;
        gdev->info.release = release;
        gdev->pdev = pdev;
-       if (pdev->irq) {
+       if (pdev->irq && (pdev->irq != IRQ_NOTCONNECTED)) {
                gdev->info.irq = pdev->irq;
                gdev->info.irq_flags = IRQF_SHARED;
                gdev->info.handler = irqhandler;
-- 
2.17.1